How to choose eardrum for children–Children’s eardrum matching method
It is well known that ear molds are often used after children have selected ear-back hearing aids. A suitable ear mold can not only help the child to fix the hearing aid, but also effectively prevent the ear screaming and improve its acoustic characteristics. Therefore, it is also called the golden partner of the ear machine. Today we come to hear the sound of Xiaobian. Introduce the ear mold for everyone.
Ear modelearmoldIs an acoustic insert, an acoustic coupler that connects the human ear to the hearing aid. It is molded according to the shape of the patient’s ear cavity and external auditory canal. It transmits the amplified sound of the hearing aid from the hearing aid receiver to the ear canal or Tympanic membrane.
The ear mold will make the hearing aid wear more stable and comfortable, and prevent the hearing aid from falling off. This is important for a lively child, and a properly sized ear mold can effectively prevent children from losing their hearing aids during sports games.
The ear mold and the external auditory canal are well sealed to prevent sound leakage and reduce the probability of hearing aids. If the child wears a hearing aid with a scream (also called howling), and if it is worn, it will be silent. This is the wrong way to wear it; but if there is a whistle after wearing the hearing aid, it may be because The ear mold is not suitable. At this time, parents should consider whether the child’s ear canal is thick and needs to be replaced.
3Improve acoustic performance
The venting holes on the ear mold control the air exchange between the inside and the outside of the ear canal, affecting the gain frequency response characteristics of the hearing aid and the comfort of the wearer, thereby improving the sound quality after hearing aid. The acoustic coupling system of the ear mold consists of an ear hook, a sound tube, a sound hole, a vent hole and a damper. In general, the vents control the acoustic effects of the low frequency region of the hearing aid, the damper controls the acoustic effects of the IF region of the hearing aid, and the horn sound hole controls the acoustic effects of the high frequency region of the hearing aid. The frequency range covered by the three coupling systems of vent hole, damper and horn sound hole has a certain overlap. The improvement of the acoustic characteristics of the hearing aid by the ear mold mainly depends on the change of the coupling system.
1.From the material produced, it can be divided into soft ear mold and hard ear mold.
(1Soft ear mold
The material is soft and can change shape temporarily after being stressed. It is not easy to cause damage to the active child, and because it is comfortable to wear, the sealing is good, and it is not easy to whistle, so the soft ear mold is the first choice for children to choose the ear back machine. The disadvantage is that the price is relatively high, and the soft ear mold is easy to age, and because of the good sealing performance, long-term use is prone to suffocation.
(2Hard ear mode
It is easy to process and can be made into various shapes, but it can not be deformed and has a long service life. The advantages are: the price is more economical, the texture is hard and durable, and the gas permeability is good. The disadvantage is that the sealing is not as good as the soft ear mold, and the ear is easily damaged when it is stressed.
2.From the shape of the ear mold can be divided into many kinds, but commonly used in the next four categories:
This is a fully enclosed, high-security, thick-thick ear mold designed to minimize any leakage and prevent acoustic feedback. Such ear molds are used for patients above severe levels and for patients with high gain, high power hearing aids. Because of its good airtightness and strong fixation, it is often used for children with severe or severe hearing loss.
2Skeleton ear mold
Except for the vicinity of the sound tube, almost all the inner portions of the ear mold are hollowed out to form a hollow coil shape. The ear mold is well ventilated and is suitable for patients with moderate to severe hearing and hearing aid users who need high frequency amplification or those whose ear canal is too straight and the ear canal is difficult to fix;
3Ear canal ear mold
This ear mold is small in size and similar to the earplugs that have been made in the market, but it needs to be customized according to the patient’s ear type, and the soundproofing effect is better, but the sealing property is inferior to other shapes, and it is only suitable for moderate to moderate. Hearing patients or hearing aid users who need high frequency amplification.
4Deep ear canal
This ear mold is developed on the basis of the ear canal ear mold. In contrast, the deep ear canal ear mold is smaller in size and can be placed deeper in the ear canal, and the concealment is better, but The sealing is inferior to other shapes of the ear mold. It is only suitable for those with low hearing loss.
3.After the hearing aid is used for a long time, the ear mold will collect dust and cockroaches.1.Wipe the ear mold with a dry, soft cloth every day, and remove dirt, such as perspiration, sputum, etc. in the sound hole.
2. In the sound tube of the ear mold, the accumulated water droplets are often generated due to a large temperature difference or moisture evaporated in the ear canal, which affects the function of the hearing aid. After discovering such a condition, the ear mold should be removed from the hearing aid to remove the water droplets and allowed to dry before use.
And bacteria, etc. In order to ensure the smooth transmission of sound and avoid infection of the ear canal, the ear mold should be cleaned regularly and allowed to dry before use.
Generally, with the development of the ear canal of the deaf children, the size of the child’s ear mold is more and more unsuitable, and often slips out of the ear canal, and the hearing aid also has a murmur. At this time, the parents need to change the ear mold for the child. If it is not replaced, the hearing aid can not be opened to the original appropriate volume position, there will be obvious howling, or the child may have the ear mold and hearing aid off when a little exercise.
Usually less than7Aged child about3-9Change once a month, teen6-24Change once a month, then it is best to go to a professional hearing aid fitting agency, let the fitter help to determine whether it needs to be replaced or treated.
In addition, the ear mold is used6After months to a year, the sound tube on the ear mold will age and harden to varying degrees. At this time, the ear mold needs to be replaced in time.
In summary, even in the highly developed digital hearing aid technology today, the ear mold technology plays a vital role in the hearing aid matching process. Children are the future of the motherland, so parents are welcome to understand the above-mentioned little common sense about ear molds. When helping children choose hearing aids, they must choose an ear mold suitable for children, so that the hearing aid can play its due role.
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